<!-- Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
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Reports subsets of files specified in the current section that overlap with other subsets in other sections. For example:
<code>[{foo,bar}]</code> and <code>[{foo,bas}]</code> both contain “foo”.
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